The quantitation of how much time constitutes short and recent varies by disease and by context, but the core denotation of acute is always qualitatively in contrast with chronic, which denotes long-lasting disease (for example, in acute leukemia and chronic leukemia).
View full size image. Thomas Edison is usually credited with the invention of the light bulb, but the famous American inventor wasn't the only one who contributed to the development of this revolutionary technology.
By the time Edison had started his lighting project in 1877, some twenty inventors had already built light bulbs with either platinum or iridium filaments heated in air, or carbon filaments heated in a vacuum. Platinum was the ideal material.